Le rôle de l’usage de l’ordinateur dans le travail scolaire des apprenants : Opinions des élèves des lycées Général Leclerc et bilingue de Yaoundé (Cameroun)

in Dili Palai, clément (Ed.) Langages, Littérature et Éducation. De la poétique des savoirs endogènes aux mutations sociale (in press)

Cet article vise à cerner autrement le rôle de l’usage de l’ordinateur dans le travail scolaire des élèves. Elle utilise à cet effet une démarche centrée sur les apprenants, c’est-à-dire sur l’examen de ... [more ▼]

Cet article vise à cerner autrement le rôle de l’usage de l’ordinateur dans le travail scolaire des élèves. Elle utilise à cet effet une démarche centrée sur les apprenants, c’est-à-dire sur l’examen de leurs opinions (ce qu’ils pensent et disent) sur ce sujet. En analysant les discours tenus par les élèves des lycées Général Leclerc et bilingue de Yaoundé sur cette question, ce travail montre que pour eux, l’usage des TIC produit une réelle valeur ajoutée pédagogique. Mais ces potentialités résultent d’une combinaison de plusieurs facteurs concernant l’élève, l’enseignant et la structure scolaire. [less ▲]

Geometrical Validity of High-Order Triangular Finite Elements

in Engineering with Computers (in press)

This paper presents a method to compute accurate bounds on Jacobian determinants of high-order (curvilinear) triangular nite elements. This method can be used to guarantee that a curvilinear triangle is ... [more ▼]

This paper presents a method to compute accurate bounds on Jacobian determinants of high-order (curvilinear) triangular nite elements. This method can be used to guarantee that a curvilinear triangle is geometrically valid, i.e., that its Jacobian determinant is strictly positive everywhere in its reference domain. It also provides an e cient way to measure the quality the triangles. The key feature of the method is to expand the Jacobian determinant using a polynomial basis, built using B ezier functions, that has both properties of boundedness and positivity. Numerical results show the sharpness of our estimates. [less ▲]

Statut de l'auteur contemporain

in MetaKatz (in press)

Apparitions, disparitions. Vers une histoire des pratiques d’édition en Belgique

in Barbier, Frédéric; Varry, Dominique (Eds.) Cinquante ans d'histoire du livre (in press)

La réception par le juge d’arguments extra-juridiques

in Chassagnard-Pinet, Sandrine (Ed.) Actes du colloque Droit, arts et sciences humaines et sociales: dépasser les frontières, Lille 19 et 20 mai 2011 (in press)

Reining in Excessive Risk Taking by Executives: The Effect of Accountability

in Theory and Decision (in press)

Performance-contingent compensation by means of stock options may induce risk taking in agents that is excessive from the point of view of the company or the shareholders. We test whether increasing ... [more ▼]

Performance-contingent compensation by means of stock options may induce risk taking in agents that is excessive from the point of view of the company or the shareholders. We test whether increasing shareholder control may be an effective checking mechanism to rein in such excessive risk taking. We thus tell one group of experimental CEOs that they may have to justify their decision making processes in front of their shareholders. This indeed reduces risk taking and increases the performance of the companies they manage. Implications are discussed. [less ▲]

Le rapport de Charles-Antoine de La Serna Santander (1752-1813) sur l’état de la Bibliothèque publique de Bruxelles en 1807

in In Monte Artium (in press)

Compte-rendu et apport de la conférence-débat : « Nature, conditionnalité et verdissement de la PAC : un tournant wallon ? ». 9 novembre 2011. Espace Senghor, Gembloux, Belgique.

in Biotechnologie, Agronomie, Société et Environnement = Biotechnology, Agronomy, Society and Environment [=BASE] (in press)

Recently, the European Union (EU) proposed a reform project for the Common Agricultural Policy (CAP). One of the proposed reforms consists in imposing to set aside 7% of arable land for biodiversity ... [more ▼]

Recently, the European Union (EU) proposed a reform project for the Common Agricultural Policy (CAP). One of the proposed reforms consists in imposing to set aside 7% of arable land for biodiversity support purposes. About this proposal, a conference was hold in Gembloux, Belgium, on 9th November 2011. Such systems already exist in neighboring countries. French and Swiss systems were displayed in order to highlight their advantages and limits. Scientific arguments subtending such policies were presented. It was shown that creation of semi-natural elements in the agricultural matrix should be efficient to promote biodiversity. Both the quantity and the quality of these elements should be considered. Also, biodiversity is likely to provide services to agriculture, notably crop pollination and pest control. Currently, uncertainties remain on eligible areas to reach the 7% threshold. However, based on most probable scenarios, the current likely eligible areas cover only 4.3% of arable land in Wallonia. Less than 20% of Walloon farms already reach the 7% threshold proposed by the EU. If the European project is approved, it will therefore be of first importance to have a societal recognition toward farmers for their effort. To optimize positive effects of the policy on biodiversity, it is also imperative to make sure that a high biological quality is reached in the areas dedicated to biodiversity and to monitor this quality in the light of clearly defined objectives. Economical, societal and environmental issues should all be considered when applying this policy in order to improve agriculture sustainability and to stop biodiversity decline in agricultural landscapes. [less ▲]

Impact de la structure spatiale de Strombosia scheffleri Engl. et Xymalos monospora (Harv.) Baill sur la régénération naturelle et la coexistence des espèces arborescentes dans la Réserve Naturelle Forestière de Bururi, Burundi

in Bois et Forêts des Tropiques (in press)

Model Predictive Control of Voltages in Active Distribution Networks

in IEEE Transactions on Smart Grid (in press)

This paper presents a centralized control scheme to regulate distribution network voltages in the presence of high penetration of distributed generation. The approach is inspired of Model Predictive ... [more ▼]

This paper presents a centralized control scheme to regulate distribution network voltages in the presence of high penetration of distributed generation. The approach is inspired of Model Predictive Control in order to compensate for modeling inaccuracies and measurement noise. The control actions, calculated from a multi-step optimization, are updated and corrected by real-time measurements. The proposed controller uses a linear model to predict the behavior of the system and the optimization is solved using quadratic programming. The proposed corrective control has been tested in a 11-kV distribution network including 75 nodes and hosting 22 distributed generating units. [less ▲]